Question

How many 4 digit numbers are there please tell with full explanation.

Answer 1

there are 999 four digit numbers from 1000-9999

Answer 2

Subtract the smallest four digit number with the highest four digit number and then add one ,then you will obtain with the number of four digit numbers.

so 9,999 - 1,000 = 8,999

then 8,999 + 1 = 9,000


Note:The four digit numbers may be negative also .So, double the number you obtained from above.

Therefore, positive four digit numbers are 9000.
And negative are 9000.
So, the four digit integers are 18000.
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